Nobita's homework complaint becomes an actual window into how civilization builds itself, one messy tribe at a time. The film moves quietly through human history instead of rushing it, letting you sit with how fragile the first structures of society really are. Kids see the wonder of creation; adults recognize the weight of every choice that leads to the world they inherited. The vignette format means it rewards rewatching because you catch different layers depending on what you're looking for. It's Doraemon doing what it does best: using a gadget to ask a real question, then letting the characters live in the answer.
Nobita's procrastination reaches peak levels when summer homework demands he write a research report. Rather than actually study, he complains to Doraemon about humanity's original sin, blaming Adam and Eve for all his suffering. Doraemon's solution: a device that lets them observe the entire genesis of civilization firsthand, documenting it all in a diary. What starts as a lazy shortcut turns into something bigger when Nobita's friends tag along to witness the formation of tribes, cultures, and societies. They're watching literal world creation unfold. But the time patrol arrives with a problem: someone's been using an illegal time machine in this era, and they're convinced Nobita and crew are involved. Suneo and Giant get arrested, leaving Nobita, Shizuka, and Doraemon scrambling to clear their names and rescue their friends. This movie balances genuine comedy with adventure, using the premise of witnessing human civilization's birth as both a setup for chaos and a backdrop for unexpected stakes. It's lighthearted but driven, mixing the goofy charm of Doraemon's gadgets with real tension when the time patrol shows up.